DOC AIRBUS | AMM A320FGround Operations in Heavy Rain or High Dust/Sand Concentration
TASK 21-26-00-860-002-A
Ground Operations in Heavy Rain or High Dust/Sand Concentration
1. Reason for the Job
To make sure that the rainwater does not go into the avionics ventilation system through the open skin air-inlet-valve during heavy rain.
To make sure that dust/sand does not go into the avionics ventilation system through the open skin air-inlet-valve during a dust/sand storm or when there is a high dust/sand concentration in the air.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 21-26-00-861-071-A Subtask 21-26-00-010-084-A
Subtask 21-26-00-040-061-A
Subtask 21-26-00-860-065-A
[Rev.10 from 2021]
2026.04.02 06:10:57 UTC
Ground Operations in Heavy Rain or High Dust/Sand Concentration
1. Reason for the Job
To make sure that the rainwater does not go into the avionics ventilation system through the open skin air-inlet-valve during heavy rain.
To make sure that dust/sand does not go into the avionics ventilation system through the open skin air-inlet-valve during a dust/sand storm or when there is a high dust/sand concentration in the air.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 831 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-33-21-618-001-A | Pre-conditioning through the LP Ground Connection (Aircraft Electrical Power Available) |
| TASK 12-33-21-618-001-A-01 | Pre-conditioning through the HP Ground Connection |
| TASK 12-33-21-618-001-A-02 | Pre-conditioning with the APU |
| TASK 12-33-21-618-001-A-03 | Pre-conditioning through the LP Ground Connection (Aircraft Electrical Power Not Available) |
| TASK 21-26-00-710-001-A | Operational Check of the Avionics Equipment Ventilation-System via MCDU |
| TASK 21-26-00-710-001-A-01 | Operational Check of the Avionics Equipment Ventilation (without the CFDS) |
| TASK 24-42-00-861-001-A | Energize the Ground Service Network from the External Power |
| TASK 24-42-00-862-001-A | De-energize the Ground Service Network Supplied from the External Power |
Location of Panels 22VU and 30VUSubtask 21-26-00-861-071-A Subtask 21-26-00-010-084-A
B. Get Access
(1) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position at the access door 831.
(2) Open the access door 831.
Subtask 21-26-00-865-090-A (1) Put an ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position at the access door 831.
(2) Open the access door 831.
C. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 21-26-00-860-064-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 6HQ | D06 |
| 49VU | AIR COND/AVNCS VENT/CTL | 5HQ | D05 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR COND/PACK TEMP/CTL SYS1/2/115VAC | 21HH | W22 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/2/28VDC | 23HH | W21 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/1/115VAC | 1HH | X22 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/1/28VDC | 3HH | X21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/2/28VDC | 24HH | Y21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/2/115VAC | 22HH | Y20 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/1/28VDC | 4HH | Y19 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/1/115VAC | 2HH | Y18 |
| ** ON A/C ALL | |||
| 122VU | AIR COND/AVNCS/VENT/MONG | 3HQ | Y17 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AE02 |
| ** ON A/C ALL | |||
| 123VU | AVNCS VENT/BLOWER/FAN | 1HQ | AD10 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AC04 |
D. Aircraft Maintenance Configuration
(1) Ground Air Pre-conditioning (Ref. AMM TASK 12-33-21-618-001).
4. Procedure(1) Ground Air Pre-conditioning (Ref. AMM TASK 12-33-21-618-001).
WARNING:
MAKE SURE THAT THERE ARE NO PERSONS OR EQUIPMENT NEAR THE RAM AIR OUTLETS.
HOT EXHAUST GASES CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(2) On the AIR COND section of the panel 30VU, push the PACK1 and PACK2 pushbutton switches (the FAULT and the OFF legends go off). Subtask 21-26-00-040-061-A
A. Deactivation of the Valves
When the aircraft is on the ground during heavy rain or dust/sand storm, or when there is a high dust/sand concentration, do this procedure:
(1) On the VENTILATION section of the overhead control and indicating panel 22VU, push the EXTRACT pushbutton switch 14HQ (the OVRD legend comes on). This causes the conditioned-air inlet-valve 21HQ and skin-exchanger isolation-valve 24HQ to open. All the other valves close.
Subtask 21-26-00-440-062-A When the aircraft is on the ground during heavy rain or dust/sand storm, or when there is a high dust/sand concentration, do this procedure:
(1) On the VENTILATION section of the overhead control and indicating panel 22VU, push the EXTRACT pushbutton switch 14HQ (the OVRD legend comes on). This causes the conditioned-air inlet-valve 21HQ and skin-exchanger isolation-valve 24HQ to open. All the other valves close.
NOTE: If the PACKS 1 and 2 (bleed air) are not available, the closing of the avionics ventilation system has these time limits:
- When the OAT (Outside Air Temperature) is less than or equal to 39 deg.C (102.20 deg.F): no limit.
- When the OAT is between 39 deg.C (102.20 deg.F) and 45 deg.C (113 deg.F): 3 hours.
- When the OAT is equal to or more than 45 deg.C (113 deg.F): 30 minutes.
B. Reactivation of the Valves
On the VENTILATION section of the overhead control and indicating panel 22VU, push the EXTRACT pushbutton switch 14HQ (the FAULT and OVRD legends go off).
Subtask 21-26-00-710-067-A 5. Close-upOn the VENTILATION section of the overhead control and indicating panel 22VU, push the EXTRACT pushbutton switch 14HQ (the FAULT and OVRD legends go off).
Subtask 21-26-00-860-065-A
A. Aircraft Maintenance Configuration
(1) On the AIR COND section of the panel 30VU, push the PACK1 and PACK2 pushbutton switches (the OFF legends come on).
Subtask 21-26-00-410-081-A Subtask 21-26-00-862-071-A (1) On the AIR COND section of the panel 30VU, push the PACK1 and PACK2 pushbutton switches (the OFF legends come on).